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Commit | Line | Data |
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b2441318 | 1 | # SPDX-License-Identifier: GPL-2.0 |
74b469f2 SR |
2 | # Unified Makefile for i386 and x86_64 |
3 | ||
2266cfd5 | 4 | # select defconfig based on actual architecture |
d746d647 | 5 | ifeq ($(ARCH),x86) |
ffee0de4 DW |
6 | ifeq ($(shell uname -m),x86_64) |
7 | KBUILD_DEFCONFIG := x86_64_defconfig | |
8 | else | |
d746d647 | 9 | KBUILD_DEFCONFIG := i386_defconfig |
ffee0de4 | 10 | endif |
d746d647 SR |
11 | else |
12 | KBUILD_DEFCONFIG := $(ARCH)_defconfig | |
13 | endif | |
2266cfd5 | 14 | |
d77698df MK |
15 | # For gcc stack alignment is specified with -mpreferred-stack-boundary, |
16 | # clang has the option -mstack-alignment for that purpose. | |
17 | ifneq ($(call cc-option, -mpreferred-stack-boundary=4),) | |
8f918697 MK |
18 | cc_stack_align4 := -mpreferred-stack-boundary=2 |
19 | cc_stack_align8 := -mpreferred-stack-boundary=3 | |
20 | else ifneq ($(call cc-option, -mstack-alignment=16),) | |
21 | cc_stack_align4 := -mstack-alignment=4 | |
22 | cc_stack_align8 := -mstack-alignment=8 | |
d77698df MK |
23 | endif |
24 | ||
1c678da3 DW |
25 | # How to compile the 16-bit code. Note we always compile for -march=i386; |
26 | # that way we can complain to the user if the CPU is insufficient. | |
de3accda DW |
27 | # |
28 | # The -m16 option is supported by GCC >= 4.9 and clang >= 3.5. For | |
a9cfccee PA |
29 | # older versions of GCC, include an *assembly* header to make sure that |
30 | # gcc doesn't play any games behind our back. | |
31 | CODE16GCC_CFLAGS := -m32 -Wa,$(srctree)/arch/x86/boot/code16gcc.h | |
de3accda DW |
32 | M16_CFLAGS := $(call cc-option, -m16, $(CODE16GCC_CFLAGS)) |
33 | ||
d6289f36 | 34 | REALMODE_CFLAGS := $(M16_CFLAGS) -g -Os -DDISABLE_BRANCH_PROFILING \ |
1c678da3 | 35 | -Wall -Wstrict-prototypes -march=i386 -mregparm=3 \ |
1c678da3 | 36 | -fno-strict-aliasing -fomit-frame-pointer -fno-pic \ |
032a2c4f MK |
37 | -mno-mmx -mno-sse |
38 | ||
39 | REALMODE_CFLAGS += $(call __cc-option, $(CC), $(REALMODE_CFLAGS), -ffreestanding) | |
40 | REALMODE_CFLAGS += $(call __cc-option, $(CC), $(REALMODE_CFLAGS), -fno-stack-protector) | |
42e0e954 | 41 | REALMODE_CFLAGS += $(call __cc-option, $(CC), $(REALMODE_CFLAGS), -Wno-address-of-packed-member) |
9e8730b1 | 42 | REALMODE_CFLAGS += $(call __cc-option, $(CC), $(REALMODE_CFLAGS), $(cc_stack_align4)) |
1c678da3 DW |
43 | export REALMODE_CFLAGS |
44 | ||
0a6ef376 SR |
45 | # BITS is used as extension for files which are available in a 32 bit |
46 | # and a 64 bit version to simplify shared Makefiles. | |
47 | # e.g.: obj-y += foo_$(BITS).o | |
48 | export BITS | |
74b469f2 | 49 | |
a0215061 | 50 | ifdef CONFIG_X86_NEED_RELOCS |
7c21383f | 51 | LDFLAGS_vmlinux := --emit-relocs --discard-none |
a0215061 KC |
52 | endif |
53 | ||
b2c51106 AL |
54 | # |
55 | # Prevent GCC from generating any FP code by mistake. | |
56 | # | |
57 | # This must happen before we try the -mpreferred-stack-boundary, see: | |
58 | # | |
59 | # https://gcc.gnu.org/bugzilla/show_bug.cgi?id=53383 | |
60 | # | |
61 | KBUILD_CFLAGS += -mno-sse -mno-mmx -mno-sse2 -mno-3dnow | |
62 | KBUILD_CFLAGS += $(call cc-option,-mno-avx,) | |
63 | ||
d746d647 | 64 | ifeq ($(CONFIG_X86_32),y) |
0a6ef376 | 65 | BITS := 32 |
8c6531f7 | 66 | UTS_MACHINE := i386 |
4ba7e5cd | 67 | CHECKFLAGS += -D__i386__ |
0a6ef376 | 68 | |
4ba7e5cd SR |
69 | biarch := $(call cc-option,-m32) |
70 | KBUILD_AFLAGS += $(biarch) | |
71 | KBUILD_CFLAGS += $(biarch) | |
0a6ef376 | 72 | |
0a6ef376 SR |
73 | KBUILD_CFLAGS += -msoft-float -mregparm=3 -freg-struct-return |
74 | ||
484d90ee AB |
75 | # Never want PIC in a 32-bit kernel, prevent breakage with GCC built |
76 | # with nonstandard options | |
77 | KBUILD_CFLAGS += -fno-pic | |
78 | ||
d77698df MK |
79 | # Align the stack to the register width instead of using the default |
80 | # alignment of 16 bytes. This reduces stack usage and the number of | |
81 | # alignment instructions. | |
9e8730b1 | 82 | KBUILD_CFLAGS += $(call cc-option,$(cc_stack_align4)) |
0a6ef376 | 83 | |
0a6ef376 | 84 | # CPU-specific tuning. Anything which can be shared with UML should go here. |
a436bb7b | 85 | include arch/x86/Makefile_32.cpu |
0a6ef376 SR |
86 | KBUILD_CFLAGS += $(cflags-y) |
87 | ||
88 | # temporary until string.h is fixed | |
89 | KBUILD_CFLAGS += -ffreestanding | |
74b469f2 | 90 | else |
0a6ef376 | 91 | BITS := 64 |
8c6531f7 | 92 | UTS_MACHINE := x86_64 |
1f2f01b1 | 93 | CHECKFLAGS += -D__x86_64__ |
0a6ef376 | 94 | |
14262d67 | 95 | biarch := -m64 |
0a6ef376 SR |
96 | KBUILD_AFLAGS += -m64 |
97 | KBUILD_CFLAGS += -m64 | |
98 | ||
be6cb027 | 99 | # Align jump targets to 1 byte, not the default 16 bytes: |
2c4fd1ac | 100 | KBUILD_CFLAGS += $(call cc-option,-falign-jumps=1) |
be6cb027 | 101 | |
52648e83 | 102 | # Pack loops tightly as well: |
2c4fd1ac | 103 | KBUILD_CFLAGS += $(call cc-option,-falign-loops=1) |
52648e83 | 104 | |
5c630089 | 105 | # Don't autogenerate traditional x87 instructions |
8f2dd677 BW |
106 | KBUILD_CFLAGS += $(call cc-option,-mno-80387) |
107 | KBUILD_CFLAGS += $(call cc-option,-mno-fp-ret-in-387) | |
5551a34e | 108 | |
d77698df MK |
109 | # By default gcc and clang use a stack alignment of 16 bytes for x86. |
110 | # However the standard kernel entry on x86-64 leaves the stack on an | |
111 | # 8-byte boundary. If the compiler isn't informed about the actual | |
112 | # alignment it will generate extra alignment instructions for the | |
113 | # default alignment which keep the stack *mis*aligned. | |
114 | # Furthermore an alignment to the register width reduces stack usage | |
115 | # and the number of alignment instructions. | |
9e8730b1 | 116 | KBUILD_CFLAGS += $(call cc-option,$(cc_stack_align8)) |
d9b0cde9 | 117 | |
d9ee948d L |
118 | # Use -mskip-rax-setup if supported. |
119 | KBUILD_CFLAGS += $(call cc-option,-mskip-rax-setup) | |
120 | ||
0a6ef376 SR |
121 | # FIXME - should be integrated in Makefile.cpu (Makefile_32.cpu) |
122 | cflags-$(CONFIG_MK8) += $(call cc-option,-march=k8) | |
123 | cflags-$(CONFIG_MPSC) += $(call cc-option,-march=nocona) | |
124 | ||
125 | cflags-$(CONFIG_MCORE2) += \ | |
126 | $(call cc-option,-march=core2,$(call cc-option,-mtune=generic)) | |
366d19e1 TD |
127 | cflags-$(CONFIG_MATOM) += $(call cc-option,-march=atom) \ |
128 | $(call cc-option,-mtune=atom,$(call cc-option,-mtune=generic)) | |
0a6ef376 SR |
129 | cflags-$(CONFIG_GENERIC_CPU) += $(call cc-option,-mtune=generic) |
130 | KBUILD_CFLAGS += $(cflags-y) | |
131 | ||
132 | KBUILD_CFLAGS += -mno-red-zone | |
133 | KBUILD_CFLAGS += -mcmodel=kernel | |
fb3fe2c0 JP |
134 | |
135 | # Intel CET isn't enabled in the kernel | |
136 | KBUILD_CFLAGS += $(call cc-option,-fcf-protection=none) | |
5d707e9c | 137 | endif |
0a6ef376 | 138 | |
0bf62763 PA |
139 | ifdef CONFIG_X86_X32 |
140 | x32_ld_ok := $(call try-run,\ | |
141 | /bin/echo -e '1: .quad 1b' | \ | |
b1e0d8b7 | 142 | $(CC) $(KBUILD_AFLAGS) -c -x assembler -o "$$TMP" - && \ |
0bf62763 PA |
143 | $(OBJCOPY) -O elf32-x86-64 "$$TMP" "$$TMPO" && \ |
144 | $(LD) -m elf32_x86_64 "$$TMPO" -o "$$TMP",y,n) | |
8bd69c2d IM |
145 | ifeq ($(x32_ld_ok),y) |
146 | CONFIG_X86_X32_ABI := y | |
147 | KBUILD_AFLAGS += -DCONFIG_X86_X32_ABI | |
148 | KBUILD_CFLAGS += -DCONFIG_X86_X32_ABI | |
149 | else | |
150 | $(warning CONFIG_X86_X32 enabled but no binutils support) | |
151 | endif | |
0bf62763 PA |
152 | endif |
153 | export CONFIG_X86_X32_ABI | |
154 | ||
3f135e57 JP |
155 | # |
156 | # If the function graph tracer is used with mcount instead of fentry, | |
157 | # '-maccumulate-outgoing-args' is needed to prevent a GCC bug | |
158 | # (https://gcc.gnu.org/bugzilla/show_bug.cgi?id=42109) | |
159 | # | |
160 | ifdef CONFIG_FUNCTION_GRAPH_TRACER | |
161 | ifndef CONFIG_HAVE_FENTRY | |
162 | ACCUMULATE_OUTGOING_ARGS := 1 | |
163 | else | |
164 | ifeq ($(call cc-option-yn, -mfentry), n) | |
165 | ACCUMULATE_OUTGOING_ARGS := 1 | |
a5859c6d JP |
166 | |
167 | # GCC ignores '-maccumulate-outgoing-args' when used with '-Os'. | |
168 | # If '-Os' is enabled, disable it and print a warning. | |
169 | ifdef CONFIG_CC_OPTIMIZE_FOR_SIZE | |
170 | undefine CONFIG_CC_OPTIMIZE_FOR_SIZE | |
7e609120 | 171 | $(warning Disabling CONFIG_CC_OPTIMIZE_FOR_SIZE. Your compiler does not have -mfentry so you cannot optimize for size with CONFIG_FUNCTION_GRAPH_TRACER.) |
a5859c6d JP |
172 | endif |
173 | ||
3f135e57 JP |
174 | endif |
175 | endif | |
176 | endif | |
177 | ||
3f135e57 | 178 | ifeq ($(ACCUMULATE_OUTGOING_ARGS), 1) |
4a1bec46 ND |
179 | # This compiler flag is not supported by Clang: |
180 | KBUILD_CFLAGS += $(call cc-option,-maccumulate-outgoing-args,) | |
3f135e57 JP |
181 | endif |
182 | ||
0a6ef376 SR |
183 | # Stackpointer is addressed different for 32 bit and 64 bit x86 |
184 | sp-$(CONFIG_X86_32) := esp | |
185 | sp-$(CONFIG_X86_64) := rsp | |
186 | ||
7b956f03 AL |
187 | # do binutils support CFI? |
188 | cfi := $(call as-instr,.cfi_startproc\n.cfi_rel_offset $(sp-y)$(comma)0\n.cfi_endproc,-DCONFIG_AS_CFI=1) | |
189 | # is .cfi_signal_frame supported too? | |
190 | cfi-sigframe := $(call as-instr,.cfi_startproc\n.cfi_signal_frame\n.cfi_endproc,-DCONFIG_AS_CFI_SIGNAL_FRAME=1) | |
191 | cfi-sections := $(call as-instr,.cfi_sections .debug_frame,-DCONFIG_AS_CFI_SECTIONS=1) | |
192 | ||
d7acb92f | 193 | # does binutils support specific instructions? |
75aaf4c3 | 194 | asinstr += $(call as-instr,pshufb %xmm0$(comma)%xmm0,-DCONFIG_AS_SSSE3=1) |
ea4d26ae | 195 | avx_instr := $(call as-instr,vxorps %ymm0$(comma)%ymm1$(comma)%ymm2,-DCONFIG_AS_AVX=1) |
7056741f | 196 | avx2_instr :=$(call as-instr,vpbroadcastb %xmm0$(comma)%ymm1,-DCONFIG_AS_AVX2=1) |
e0a491c1 | 197 | avx512_instr :=$(call as-instr,vpmovm2b %k1$(comma)%zmm5,-DCONFIG_AS_AVX512=1) |
e38b6b7f | 198 | sha1_ni_instr :=$(call as-instr,sha1msg1 %xmm0$(comma)%xmm1,-DCONFIG_AS_SHA1_NI=1) |
199 | sha256_ni_instr :=$(call as-instr,sha256msg1 %xmm0$(comma)%xmm1,-DCONFIG_AS_SHA256_NI=1) | |
d7acb92f | 200 | |
e0a491c1 GK |
201 | KBUILD_AFLAGS += $(cfi) $(cfi-sigframe) $(cfi-sections) $(asinstr) $(avx_instr) $(avx2_instr) $(avx512_instr) $(sha1_ni_instr) $(sha256_ni_instr) |
202 | KBUILD_CFLAGS += $(cfi) $(cfi-sigframe) $(cfi-sections) $(asinstr) $(avx_instr) $(avx2_instr) $(avx512_instr) $(sha1_ni_instr) $(sha256_ni_instr) | |
0a6ef376 | 203 | |
d503ac53 | 204 | KBUILD_LDFLAGS := -m elf_$(UTS_MACHINE) |
25dfeeb7 | 205 | |
e3d03598 L |
206 | # |
207 | # The 64-bit kernel must be aligned to 2MB. Pass -z max-page-size=0x200000 to | |
208 | # the linker to force 2MB page size regardless of the default page size used | |
209 | # by the linker. | |
210 | # | |
211 | ifdef CONFIG_X86_64 | |
d503ac53 | 212 | KBUILD_LDFLAGS += $(call ld-option, -z max-page-size=0x200000) |
e3d03598 L |
213 | endif |
214 | ||
25dfeeb7 SR |
215 | # Workaround for a gcc prelease that unfortunately was shipped in a suse release |
216 | KBUILD_CFLAGS += -Wno-sign-compare | |
217 | # | |
218 | KBUILD_CFLAGS += -fno-asynchronous-unwind-tables | |
0a6ef376 | 219 | |
76b04384 DW |
220 | # Avoid indirect branches in kernel to deal with Spectre |
221 | ifdef CONFIG_RETPOLINE | |
4cd24de3 | 222 | KBUILD_CFLAGS += $(RETPOLINE_CFLAGS) |
ce02ef06 DB |
223 | # Additionally, avoid generating expensive indirect jumps which |
224 | # are subject to retpolines for small number of switch cases. | |
225 | # clang turns off jump table generation by default when under | |
a9d57ef1 DB |
226 | # retpoline builds, however, gcc does not for x86. This has |
227 | # only been fixed starting from gcc stable version 8.4.0 and | |
228 | # onwards, but not for older ones. See gcc bug #86952. | |
229 | ifndef CONFIG_CC_IS_CLANG | |
230 | KBUILD_CFLAGS += $(call cc-option,-fno-jump-tables) | |
231 | endif | |
76b04384 DW |
232 | endif |
233 | ||
3ce9e53e | 234 | archscripts: scripts_basic |
6520fe55 PA |
235 | $(Q)$(MAKE) $(build)=arch/x86/tools relocs |
236 | ||
303395ac PA |
237 | ### |
238 | # Syscall table generation | |
239 | ||
240 | archheaders: | |
1f57d5d8 | 241 | $(Q)$(MAKE) $(build)=arch/x86/entry/syscalls all |
303395ac | 242 | |
0a6ef376 SR |
243 | ### |
244 | # Kernel objects | |
245 | ||
700efc1b EB |
246 | head-y := arch/x86/kernel/head_$(BITS).o |
247 | head-y += arch/x86/kernel/head$(BITS).o | |
f2d85299 | 248 | head-y += arch/x86/kernel/ebda.o |
8d152e7a | 249 | head-y += arch/x86/kernel/platform-quirks.o |
0a6ef376 SR |
250 | |
251 | libs-y += arch/x86/lib/ | |
252 | ||
d1f0ae5e SR |
253 | # See arch/x86/Kbuild for content of core part of the kernel |
254 | core-y += arch/x86/ | |
0a6ef376 SR |
255 | |
256 | # drivers-y are linked after core-y | |
257 | drivers-$(CONFIG_MATH_EMULATION) += arch/x86/math-emu/ | |
258 | drivers-$(CONFIG_PCI) += arch/x86/pci/ | |
259 | ||
260 | # must be linked after kernel/ | |
261 | drivers-$(CONFIG_OPROFILE) += arch/x86/oprofile/ | |
262 | ||
cf7700fe | 263 | # suspend and hibernation support |
0a6ef376 | 264 | drivers-$(CONFIG_PM) += arch/x86/power/ |
cf7700fe | 265 | |
0a6ef376 | 266 | drivers-$(CONFIG_FB) += arch/x86/video/ |
0a6ef376 SR |
267 | |
268 | #### | |
269 | # boot loader support. Several targets are kept for legacy purposes | |
270 | ||
271 | boot := arch/x86/boot | |
272 | ||
1648e4f8 | 273 | BOOT_TARGETS = bzlilo bzdisk fdimage fdimage144 fdimage288 isoimage |
f9c5107c PA |
274 | |
275 | PHONY += bzImage $(BOOT_TARGETS) | |
0a6ef376 SR |
276 | |
277 | # Default kernel to build | |
278 | all: bzImage | |
279 | ||
280 | # KBUILD_IMAGE specify target image being built | |
f9c5107c | 281 | KBUILD_IMAGE := $(boot)/bzImage |
0a6ef376 | 282 | |
f9c5107c | 283 | bzImage: vmlinux |
ca0e9bad MH |
284 | ifeq ($(CONFIG_X86_DECODER_SELFTEST),y) |
285 | $(Q)$(MAKE) $(build)=arch/x86/tools posttest | |
286 | endif | |
0a6ef376 SR |
287 | $(Q)$(MAKE) $(build)=$(boot) $(KBUILD_IMAGE) |
288 | $(Q)mkdir -p $(objtree)/arch/$(UTS_MACHINE)/boot | |
41b3eae6 | 289 | $(Q)ln -fsn ../../x86/boot/bzImage $(objtree)/arch/$(UTS_MACHINE)/boot/$@ |
0a6ef376 | 290 | |
f9c5107c PA |
291 | $(BOOT_TARGETS): vmlinux |
292 | $(Q)$(MAKE) $(build)=$(boot) $@ | |
0a6ef376 | 293 | |
1648e4f8 PA |
294 | PHONY += install |
295 | install: | |
296 | $(Q)$(MAKE) $(build)=$(boot) $@ | |
297 | ||
0a6ef376 SR |
298 | PHONY += vdso_install |
299 | vdso_install: | |
d603c8e1 | 300 | $(Q)$(MAKE) $(build)=arch/x86/entry/vdso $@ |
0a6ef376 | 301 | |
829fe4aa BH |
302 | archprepare: checkbin |
303 | checkbin: | |
e9666d10 | 304 | ifndef CONFIG_CC_HAS_ASM_GOTO |
829fe4aa BH |
305 | @echo Compiler lacks asm-goto support. |
306 | @exit 1 | |
307 | endif | |
25896d07 MY |
308 | ifdef CONFIG_RETPOLINE |
309 | ifeq ($(RETPOLINE_CFLAGS),) | |
310 | @echo "You are building kernel with non-retpoline compiler." >&2 | |
311 | @echo "Please update your compiler." >&2 | |
312 | @false | |
313 | endif | |
314 | endif | |
829fe4aa | 315 | |
0a6ef376 SR |
316 | archclean: |
317 | $(Q)rm -rf $(objtree)/arch/i386 | |
318 | $(Q)rm -rf $(objtree)/arch/x86_64 | |
319 | $(Q)$(MAKE) $(clean)=$(boot) | |
b2d668da | 320 | $(Q)$(MAKE) $(clean)=arch/x86/tools |
0a6ef376 SR |
321 | |
322 | define archhelp | |
37f30e21 AK |
323 | echo '* bzImage - Compressed kernel image (arch/x86/boot/bzImage)' |
324 | echo ' install - Install kernel using' | |
caa27b66 SR |
325 | echo ' (your) ~/bin/$(INSTALLKERNEL) or' |
326 | echo ' (distribution) /sbin/$(INSTALLKERNEL) or' | |
37f30e21 AK |
327 | echo ' install to $$(INSTALL_PATH) and run lilo' |
328 | echo ' fdimage - Create 1.4MB boot floppy image (arch/x86/boot/fdimage)' | |
329 | echo ' fdimage144 - Create 1.4MB boot floppy image (arch/x86/boot/fdimage)' | |
330 | echo ' fdimage288 - Create 2.8MB boot floppy image (arch/x86/boot/fdimage)' | |
331 | echo ' isoimage - Create a boot CD-ROM image (arch/x86/boot/image.iso)' | |
332 | echo ' bzdisk/fdimage*/isoimage also accept:' | |
333 | echo ' FDARGS="..." arguments for the booted kernel' | |
334 | echo ' FDINITRD=file initrd for the booted kernel' | |
0a6ef376 | 335 | endef |